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DESCRIPTIVE STATISTICS

1. Measuring the Spread of Data

   • Range
     • Difference between the maximum and the minimum data value
   • Interquartile Range
     • Upper quartile - Lower quartile
       • Data set divided in two and each half in two

2. Five Number Summary

   • Minimum Value
   • Lower Quartile Q1
   • Median Q2
   • Upper Quartile Q3
   • Maximum Value

3. Cumulative Frequency Graphs

   • Percentile
     • Score below which % of data lies.
   • First the table then the graph.

4. Standard Deviation

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